Physics Lab Final

No

If you calculated 90 ± 4 Ohms and the manufacturer says it is 100 Ohms with a 5% tolerance, do your data support the manufacturer's claims?

(1/dI)=(-1/dO)+(1/f)

If you create a graph of 1/dI vs. 1/dO, what is the appropriate version of the equation relating dI, dO, and f that you have graphed?

False

It is OK to turn the power on to the circuit before my TA checks it.

virtual

The image is considered _ if the distance to the image is negative.

independent

when making a graph, data plotted on the x axis should be the _ variable

Req= R1*R2/(R1+R2)

Complete the formula for the equivalent resistance, Req, for two individual resistors with resistances R1 and R2 connected in parallel. (Use any variable or symbol stated above as necessary.)

b. Where the lines are closely packed together the field is strong. e. Where the lines are widely separated the field is weak

Consider the various maps of the magnetic field lines that you created during the lab. Which of the following best describes the relationship between how closely spaced the field lines are and the strength of the magnetic field? Two correct answers required for full credit. Select one or more: a. There is no obvious correlation between the spacing of field lines and the strength of the field. b. Where the lines are closely packed together the field is strong. c. Where the lines are widely separated the field is strong. d. Where the lines are closely packed together the field is weak. e. Where the lines are widely separated the field is weak.

True

Direct viewing of a laser light can cause injury to your eyes.

n1sinθ1 = n2sinθ2

Express Snell's Law describing how a ray of light bends as it travels from medium 1 to medium 2 in terms of the index of refraction of medium 1 (n1) and medium 2 (n2), the incident angle in the first medium (θ1), and the refracted angle in the second medium (θ2).

1.16 m +- 0.03 m

From the following measurements of the length of a table, calculate the average and standard deviation. Report it using correct significant digits according to rule 1 and rule 2 in the lab manual. 1.19 m 1.12 m 1.18 m 1.15 m 1.17 m

3

How many principal rays can be drawn in a ray diagram for a thin lens?

37% of the initial charge on the capacitor

How much charge will remain on the plates of a discharging capacitor after a length of time equal to one time constant?

1.7505E8 ± 6.07E5 m/s

If the index of refraction of a plastic prism is 1.71260 ± 0.00595, what is the speed of light as it travels through the prism? (Use 2.998 108 m/s for c.)

20%

If there is no fourth colored band marked on a resistor, the tolerance of the resistor will be

1/Req

If we create a plot of I vs V, the value of the slope of a linear best fit line will be equal to the which of the following?

Yes

If you calculated 106 ± 1 Ohms and the manufacturer says it is 100 Ohms with a 5% tolerance, do your data support the manufacturer's claims?

m=D λ/a

If you create a plot of distance from center of the diffraction pattern (y) vs. the number of dark fringes (m), what would the slope of your best-fit line be equal to? (Use the following as necessary: λ for the wavelength, D for the distance from the slit to the screen, anda for the slit width.)

R=260.00+-10.00 ohms?? wrong

If you made a plot of current versus voltage and calculated a slope of (0.00378 ± 0.000218) A/V. What is the value of R assuming the data were plotted in MKS units?******

Resistance: 390 ohms Absolute uncertainty: 39 ohms

If you receive a resistor with the bands in the following order: ORANGE WHITE BROWN SILVER what is the resistance of the resistor and its absolute uncertainty (tolerance)?

power per unit area

Illuminance should be reported in which of the following units?

x-axis: sin outside (unitless) y axis: sin inside (unitless) sine of angle inside prism vs. sine of angle outside of prism

In ANALYSIS section 2 of this lab, you will make a plot to verify Snell's Law. On the plot below, correctly select the title of the graph and the labels and units of the variables you will plot on the x- and y-axes.

x-axis: 1/dO (1/m) y-axis: 1/dI (1/m) title: Inverse image distance vs. inverse object distance

In the ANALYSIS section of this lab, you will make a plot to determine the focal length of a lens. On the plot below, correctly select the title of the graph and the labels and units of the variables you will plot on the x- and y-axes.

x axis: m (unitless) y axis: y (m) title: distance from center of diffraction pattern vs dark fringe number

In the ANALYSIS section of this lab, you will make a plot to determine the wavelength of the laser you used in the experiment. On the plot below, correctly select the title of the graph and the labels and units of the variables you will plot on the x- and y-axes.

x axis: cos^2 (unitless) y axis: intensity (lux) title: light intensity vs cos^2

In the ANALYSIS section of this lab, you will make a plot which you will fit with a best-fit line. (Hint: You will make two graphs, but in only one of them will you use a linear fit for your data.) On the plot below, correctly select the title of the graph and the labels and units of the variables you will plot on the x- and y-axes.

the current through R1 is much larger than the current through R2

Suppose you have two resistors, R1 and R2, connected in parallel to a power source of voltage V, and that the resistor R2 has a much higher resistance than R1. Which of the following statements is true?

b. The currents through R1 and R2 are the same d. The voltage drop across R2 is much larger than across R1

Suppose you have two resistors, R1 and R2, connected in series to a power source of voltage V, and that the resistor R2 has a much higher resistance than R1. Which of the following statements are true? Select one or more: a. The voltage drop across R1 is much larger than across R2. b. The currents through R1 and R2 are the same. c. The current through R1 is much larger than the current through R2. d. The voltage drop across R2 is much larger than across R1. e. The current through R2 is much larger than the current through R1.

R3>R1>R2

The accompanying graph shows the I (current) vs V (potential difference) characteristics for three different resistors. Which is the correct ranking order?

c. This is a convergent lens. d. The magnification is about 2. e. The image is virtual.

The diagram shows 2 out of the 3 possible principal rays traversing a thin lens of unknown type. The focal points are labeled F1 and F2, the object is at O, and the image is at I. Which of the following statements are true?

T1 > T2 = T4 > T3

The diagram shows 4 RC circuits identified by a numeral. Which of the following statements about the time constants is correct?

The upper and lower media have the same index of refraction in A The lower medium in C has the same index of refraction as the the lower medium in D

The diagram shows 4 pairs of transparent media with various indexes of refraction. A red laser beam is incident upon the interface producing reflected and refracted beams. The top medium is the same in all cases, but the bottom medium is different in all cases. Which two of the following statements are correct? Mark both for full credit.

Image 1

The diagram shows a divergent thin lens with foci at F1 and F2. The object on the left, at position O, generates only one of the five images shown identified by numbers. Which of these images is the correct one?

Ceq=C1+C2

The equivalent capacitance, Ceq, of two capacitors C1 and C2 connected in parallel can be expressed as which of the following?

True

The failure to have my TA check my setup before turning on the power could result in damage to the setup and/or bad data.

a, b, c, g

The figure shows some field lines connecting two magnets and may be similar to one of the maps you obtained during the lab activity. What are the magnetic polarities of the poles labeled A, B, C, D? Select one or more: a. B is N b. D is N c. C is S d. B is S e. A is N f. C is N g. A is S h. D is S

2 (phase shift every 180 degrees)

The group that worked at your station in the preceding lab left a copy of one of the plots they made during the lab. If the plot looks like the image shown below, how many polarizers were used to make the plot? (Assume that the unpolarized light of 20 lux falls on the first polarizer, and if more than two polarizers are used, assume only the second polarizer rotates.)

light source, polarizing screen, lab pro interface, optical bench

The instruments you will be using this week include the following. (Select all that apply.) Select one or more: digital multimeter light source polarizing screen oscilloscope lab pro interface optical densometer optical bench

6

The maximum voltage of the power source should be kept below _ volts throughout this experiment.

True

The optical apparatus is delicate and prone to damage and should be handled delicately.

True

The optical apparatus is delicate and you should not touch the polarizing screens surfaces.

North, South

The south end of a compass in the Earth's magnetic field points toward the geomagnetic _ pole, which is located near the Earth's geographic _ pole.

RC

The time constant is equal to which of the following?

Greek letter tau, τ

The time constant is represented by what letter?

positive

The value of the focal length of a converging lens is which of the following?

x axis: time in s y axis: voltage in V title: Voltage vs. Time

This week, in Analysis, you will make a graph that you will use to determine RC using an exponential function. on the plot below, correctly select the title of the graph and the labels and units you will plot on the x- and y-axes.

Yes

You calculated a equivalent capacitance of 0.46 μF ± 0.09μF. If the manufacturer has labeled the capacitor as 0.5 μF ± 10%, is this consistent with your result?

No

You calculated a equivalent capacitance of 0.59 μF ± 0.02 μF. If the manufacturer has labeled the capacitor as 0.5 μF ± 10%, is this consistent with your result?

No

You calculated a equivalent capacitance of 0.62 μF ± 0.02μF. If the manufacturer has labeled the capacitor as 0.5 μF ± 10%, is this consistent with your result?

No

You calculated a equivalent capacitance of 0.62 μF ± 0.04 μF. If the manufacturer has labeled the capacitor as 0.5 μF ± 10%, is this consistent with your result?

0.45E-6 F

You calculated a value of 0.45 s for the time constant from your graph. If you used a 1MΩ resistor, what is the equivalent capacitance of your circuit?

0.53E-6 ± 0.08E-6 F

You calculated a value of 0.53 s ± 0.06 s for the time constant from your graph. If you used a 1MΩ resistor with a tolerance of 10%, what is the equivalent capacitance of your circuit (including the uncertainty)?

0.54E-6 F

You calculated a value of 0.54 s for the time constant from your graph. If you used a 1MΩ resistor, what is the equivalent capacitance of your circuit?

0.136 +- 0.005 m

You create a plot of 1/dI (in 1/m) vs. 1/dO (in 1/m) for the data for an unknown lens and get a y-intercept of 7.35 ± 0.27. What is the focal length of the lens?

Yes

You create a plot of 1/dI (in 1/m) vs. 1/dO (in 1/m) from the data you took for an unknown lens. If the slope of the best-fit line is −1.493 ± 0.02279, should you be concerned about the quality of your data?

44 +- 5 ohms

You create a plot of I (in A) vs. V (in V) and the linear fit of your graph gives a slope of 0.02285 ± 0.00248. What is the equivalent resistance of your circuit and its uncertainty?

0.5128 s

You create a plot of voltage (in V) vs. time (in s) for an RC circuit as the capacitor is charging, where V=Vo*(1-e^(-t/RC)). You curve fit the data using the inverse exponent function Y=A*(1-e^-Cx)+B and LoggerPro gives the following values for A, B, and C. A = 4. 611 B = 0.1599 C = 1.95 What is the time constant?

0.53 +- 0.06 s

You create a plot of voltage (in V) vs. time (in s) for an RC circuit as the capacitor is charging, where V=Vo*(1-e^(-t/RC)). You curve fit the data using the inverse exponent function Y=A*(1-e^-Cx)+B and LoggerPro gives the following values for A, B, and C. A = 4.211 ± 0.4211 B = 0.1699 ± 0.007211 C = 1.901 ± 0.2051 What is the time constant and its uncertainty?

0.4998 s

You create a plot of voltage (in V) vs. time (in s) for an RC circuit as the capacitor is charging, where V=Vo*(1-e^(-t/RC)). You curve fit the data using the inverse exponent function Y=A*(1-e^-Cx)+B and LoggerPro gives the following values for A, B, and C. A = 4.46 B = 0.1849 C = 2.001 What is the time constant?

a) 260.4 +- 8.408 lux b) 12.45 +- 2.141 lux

You set up an experiment with two polarizer screens on an optical bench and collect data for the intensity of the light at the detector as you vary the relative angle between the transmission axes of the polarizers. You create a plot of light intensity (in lux) vs cos2 θ with your data and get a linear fit for your graph gives a slope of 130.2 ± 4.204 and a y-intercept of 12.45 ± 2.141. (a) What is intensity of the light source you used in your experiment? _ lux (b) What is ambient light in the room as you took your data? _ lux

1.26 +- 0.09

You shine a laser on a plastic prism made from an unknown material and measure the angles relative to the normal that the light takes both inside and outside the medium. You make a plot of sin θinside versus sin θoutside for the plastic object and calculate the slope of best-fit line of your plot to be 0.79365 ± 0.05669. What is the index of refraction of the plastic object?

A, B, D

You will investigate the magnetic field due to which of the following? (Select all that apply.) Select one or more: a. configurations with a single bar magnet b. configurations with 2 bar magnets c. configurations with 3 bar magnets d. a coil of current-carrying wire

inverted exponent

You will use the curve-fitting feature of LoggerPro to fit the charging portion of your graphs to a _ function.

natural exponent

You will use the curve-fitting feature of LoggerPro to fit the discharging portion of your graphs to a _ function.

the focal point and the lens

f is the distance between which of the following?

South, North

the north end of a compass in the Earth's magnetic field points toward the geomagnetic _ pole, which is located near the Earth's geographic _ pole

amperes

What are the units of current

linear

According to Ohm's Law, if you create a graph of current (I) vs potential difference (V), you would expect a _ relationship.

I=Io/2 * cos(θ)^2

According to the Law of Malus, what is the intensity of the light detected at a light sensor (I) after it has passed through two polarizing screens as a function of the initial intensity of the light source (I0) and relative angle between the transmission axes of the two screens (θ)?

equal to

According to the Law of Reflection, the angle of incidence is _ than the angle of reflection.

the normal to the surface of the plastic medium

All angles in this lab should be measured from which of the following? Select one: the normal to the surface of the plastic medium the surface of the plastic medium the initial path of the incoming ray the final path of the outgoing ray

bright

In the picture on page X-1 in your lab manual (the first page of this lab), dark areas represent _ bands in the pattern

2 resistors in parallel 2 resistors in series

In this week's lab, you will take data for which of the following resistor combinations? (Select all that apply.) Select one or more: 1 resistor in series with 2 resistors in parallel 2 resistors in parallel 3 resistors in series 2 resistors in series 3 resistors in parallel

reflection

Light bouncing off of a boundary between two different media is called

B, D

Magnetic field lines always point in which direction? (Select all that apply.) Select one or more: a. away from magnetic south poles b. toward magnetic south poles c. toward magnetic north poles d. away from magnetic north poles

True

Never look directly at the reflected laser light from a mirrored surface.

True

Never look directly into the aperture from which the laser light is emitted.

b. As the compass enters one end of the coil, the needle aligns with the axis of the coil and its orientation does not change as you move the compass along the interior of the coil and exit at the other end. c. If I always move in the direction indicated by the compass needle, thus following a given field line, my path will trace a loop going through the inside of the coil and returning to my point of departure.

Recall the behavior of the compass needle as you explored the magnetic field created by the coil. Indicate which two of the following five statements are true. Select one or more: a. It is not possible to decide which end of the coil is a magnetic North when current is flowing through the coil. b. As the compass enters one end of the coil, the needle aligns with the axis of the coil and its orientation does not change as you move the compass along the interior of the coil and exit at the other end. c. If I always move in the direction indicated by the compass needle, thus following a given field line, my path will trace a loop going through the inside of the coil and returning to my point of departure. d. If I always move in the direction indicated by the compass needle, thus following a given field line, my path will trace a loop going around the coil without entering it and returning to my point of departure. e. As the compass enters one end of the coil, the needle first aligns with the axis of the coil and its orientation reverses as you move the compass along the interior of the coil and exit at the other end.

c. Where the field is strong the compass needle readily and quickly aligns with rapid oscillations around the equilibrium direction. Correct d. Where the field is weak the compass needle slowly oscillates around the final equilibrium position. Correct

Recall the observed behavior of the compass during the mapping of the magnetic field. Which of the following descriptions best matches the behavior you observed? Two correct answers required for full credit. Select one or more: a. Where the field is weak the compass needle readily and quickly aligns with rapid oscillations around the equilibrium direction. b. Where the field is strong the compass needle slowly oscillates around the final equilibrium position. c. Where the field is strong the compass needle readily and quickly aligns with rapid oscillations around the equilibrium direction. d. Where the field is weak the compass needle slowly oscillates around the final equilibrium position. e. Where the field is weak the compass needle rapidly oscillates around the final equilibrium position.

Yes

Two students measure the strength of a certain magnetic field to have the following values: Student A: 1.14 ± 0.05 T Student B: 1.19 ± 0.03 T Do the two students agree for the strength of the magnetic field?

No

Two students measure the strength of a certain magnetic field to have the following values: Student A: 1.32 ± 0.01 T Student B: 1.37 ± 0.03 T Do the two students agree for the strength of the magnetic field?

9Io/32

Unpolarized light of intensity I0 is sent through three polarizing sheets as shown in the figure. The polarizing direction of the first sheet is vertical. The polarizing direction of the second sheet is rotated counterclockwise by 30 degrees with respect to the vertical. The polarizing direction of the third sheet is rotated counterclockwise by 60 degrees with respect to the vertical. What is the emergent intensity I ?

300 +- 20 ohms

Using the colored bands on the two resistors at your table, you determine that the two resistances of the resistors are 200 ohms with 5% tolerance and 100 ohms with a 20% tolerance. What would you expect the equivalent resistance of the two resistors to be (including the uncertainty) if they are connected in series?

volts

What are the units of potential difference

Ohms

What are the units of resistance

capacitors, resistors, and LabPro voltmeter

What equipment will you be using this week? (Select all that apply.) Select one or more: digital multimeter (DMM) capacitors oscilloscope resistors LabPro voltmeter

resistors, LabPro voltmeter, capacitors

What equipment will you be using this week? (Select all that apply.) Select one or more: resistors LabPro voltmeter oscilloscope digital multimeter (DMM) capacitors

A, C

What instruments will you be using in lab? (Select all that apply.) Select one or more: a. compass b. meterstick c. magnets d. triple beam balance e. protractor

voltage probe and current probe

What instruments will you be using in this week's lab? (Select all that apply.) Select one or more: voltage probe current probe ohm meter meter stick triple beam balance

PASCO light source, white metal screen, lenses

What instruments will you be using this week? (Select all that apply.) Select one or more: PASCO light source protractor oscilloscope white metal screen lenses triple beam balance

power pack, protractor, PASCO light source, ray optics kit

What instruments will you be using this week? (Select all that apply.) Select one or more: oscilloscope digital thermometer power pack protractor PASCO light source ray optics kit

farads (F)

What is the SI unit of capacitance?

Vc = Vo * (1-e^(-1/τ))

What is the equation describing the voltage across the capacitor, VC, as the capacitor is charging in terms of the peak voltage V0 and the time constant of the circuit τ?

Vc=Vo * e^(-t/τ)

What is the equation describing the voltage across the capacitor, VC, as the capacitor is discharging in terms of the peak voltage V0 and the time constant of the circuit τ?

Vc=Vo*e^(-1/Tau)

What is the equation describing the voltage across the capacitor, VC, as the capacitor is discharging in terms of the peak voltage V0 and the time constant of the circuit τ?

1MΩ

What is the value of the resistor you will be using this week?

dependent

When making a graph, data plotted on the y axis should be the _ variable

0

When setting up the light source on the optical bench, it should be positioned at the _ cm mark on the bench.

voltage drop

When two resistors are connected in parallel, the _ is the same across each resistor

-1

When you create a best fit line what is the expected value of the slope?

current and voltage

Which of the following will you be directly measuring? (Select all that apply.) Select one or more: resistance voltage current